[115385] in North American Network Operators' Group
RE: Wireless bridge
daemon@ATHENA.MIT.EDU (Bret Clark)
Thu Jun 18 13:58:08 2009
From: Bret Clark <bclark@spectraaccess.com>
To: nanog@nanog.org
In-Reply-To: <DB9EA494D2E5614D842C2BC65C2D17227C4146@mail-ww.vanoppen.com>
Date: Thu, 18 Jun 2009 13:56:52 -0400
Reply-To: bclark@spectraaccess.com
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Thu, 2009-06-18 at 09:34 -0700, John van Oppen wrote:
> -----Original Message-----
> From: Tim Huffman [mailto:Tim@bobbroadband.com]
> Sent: Thursday, June 18, 2009 9:27 AM
> To: nanog@nanog.org
> Subject: RE: Wireless bridge
>
> > The line of sight is all clear, no trees. Only one building along
> the
> way
> > has a rooftop of similar height, but the antennas are extended far
> above
> > the
> > roofline. We have used a rifle scope to confirm line of sight is all
> clear
> > at all angles.
> >
>
> Unfortunately, you can't necessarily rely on visual line of sight. At
> 800meters, the Fresnel Zone on your radio is about 14ft in diameter at
> the midpoint. You need to make sure that this is free of obstructions.
>
Not only that, the radios may actually be screaming at each other at
those distances which will affect performance
